* Re: [PATCH v2 1/2] ASoC: fsl_mqs: Don't check clock is NULL before calling clk API
From: Shengjiu Wang @ 2020-06-23 11:35 UTC (permalink / raw)
To: Markus Elfring
Cc: Linux-ALSA, Timur Tabi, Xiubo Li, Fabio Estevam, Shengjiu Wang,
kernel-janitors, Takashi Iwai, linux-kernel, Nicolin Chen,
Mark Brown, linuxppc-dev
In-Reply-To: <24be48d2-63de-b900-cec7-d21e83a89ca2@web.de>
On Tue, Jun 23, 2020 at 4:55 PM Markus Elfring <Markus.Elfring@web.de> wrote:
>
> > clk_prepare_enable and clk_disable_unprepare check the input
> > clock parameter in the beginning of the function,
>
> These functions call further functions which perform null pointer checks.
>
>
> > if the parameter
> > is NULL, clk_prepare_enable and clk_disable_unprepare will
> > return immediately.
>
> The interpretation of these function implementations seems to be reasonable.
> Would you like to achieve any improvements for the corresponding software documentation?
Which document do you mean?
>
>
> > So Don't need to check input clock parameters before calling clk API.
>
> What do you find imperative in this wording?
>
> Another wording alternative:
> Thus omit extra null pointer checks before four function calls.
>
> Regards,
> Markus
^ permalink raw reply
* Re: [PATCH v1 3/3] powerpc/mm/radix: Free PUD table when freeing pagetable
From: Aneesh Kumar K.V @ 2020-06-23 10:40 UTC (permalink / raw)
To: Bharata B Rao, linuxppc-dev; +Cc: npiggin, Bharata B Rao
In-Reply-To: <20200623073017.1951-4-bharata@linux.ibm.com>
Bharata B Rao <bharata@linux.ibm.com> writes:
> remove_pagetable() isn't freeing PUD table. This causes memory
> leak during memory unplug. Fix this.
>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
> ---
> arch/powerpc/mm/book3s64/radix_pgtable.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 58e42393d5e8..8ec2110eaa1a 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -782,6 +782,21 @@ static void free_pmd_table(pmd_t *pmd_start, pud_t *pud)
> pud_clear(pud);
> }
>
> +static void free_pud_table(pud_t *pud_start, p4d_t *p4d)
> +{
> + pud_t *pud;
> + int i;
> +
> + for (i = 0; i < PTRS_PER_PUD; i++) {
> + pud = pud_start + i;
> + if (!pud_none(*pud))
> + return;
Should we do a VM_WARN() here?
> + }
> +
> + pud_free(&init_mm, pud_start);
> + p4d_clear(p4d);
> +}
> +
> struct change_mapping_params {
> pte_t *pte;
> unsigned long start;
> @@ -956,6 +971,7 @@ static void __meminit remove_pagetable(unsigned long start, unsigned long end)
>
> pud_base = (pud_t *)p4d_page_vaddr(*p4d);
> remove_pud_table(pud_base, addr, next);
> + free_pud_table(pud_base, p4d);
> }
>
> spin_unlock(&init_mm.page_table_lock);
> --
> 2.21.3
^ permalink raw reply
* Re: [PATCH v1 2/3] powerpc/mm/radix: Fix PTE/PMD fragment count for early page table mappings
From: Aneesh Kumar K.V @ 2020-06-23 10:37 UTC (permalink / raw)
To: Bharata B Rao, linuxppc-dev; +Cc: npiggin, Bharata B Rao
In-Reply-To: <20200623073017.1951-3-bharata@linux.ibm.com>
Bharata B Rao <bharata@linux.ibm.com> writes:
> We can hit the following BUG_ON during memory unplug:
>
> kernel BUG at arch/powerpc/mm/book3s64/pgtable.c:342!
> Oops: Exception in kernel mode, sig: 5 [#1]
> LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA pSeries
> NIP [c000000000093308] pmd_fragment_free+0x48/0xc0
> LR [c00000000147bfec] remove_pagetable+0x578/0x60c
> Call Trace:
> 0xc000008050000000 (unreliable)
> remove_pagetable+0x384/0x60c
> radix__remove_section_mapping+0x18/0x2c
> remove_section_mapping+0x1c/0x3c
> arch_remove_memory+0x11c/0x180
> try_remove_memory+0x120/0x1b0
> __remove_memory+0x20/0x40
> dlpar_remove_lmb+0xc0/0x114
> dlpar_memory+0x8b0/0xb20
> handle_dlpar_errorlog+0xc0/0x190
> pseries_hp_work_fn+0x2c/0x60
> process_one_work+0x30c/0x810
> worker_thread+0x98/0x540
> kthread+0x1c4/0x1d0
> ret_from_kernel_thread+0x5c/0x74
>
> This occurs when unplug is attempted for such memory which has
> been mapped using memblock pages as part of early kernel page
> table setup. We wouldn't have initialized the PMD or PTE fragment
> count for those PMD or PTE pages.
>
> Fixing this includes 3 parts:
>
> - Re-walk the init_mm page tables from mem_init() and initialize
> the PMD and PTE fragment count to 1.
> - When freeing PUD, PMD and PTE page table pages, check explicitly
> if they come from memblock and if so free then appropriately.
> - When we do early memblock based allocation of PMD and PUD pages,
> allocate in PAGE_SIZE granularity so that we are sure the
> complete page is used as pagetable page.
>
> Since we now do PAGE_SIZE allocations for both PUD table and
> PMD table (Note that PTE table allocation is already of PAGE_SIZE),
> we end up allocating more memory for the same amount of system RAM.
> Here is a comparision of how much more we need for a 64T and 2G
> system after this patch:
>
> 1. 64T system
> -------------
> 64T RAM would need 64G for vmemmap with struct page size being 64B.
>
> 128 PUD tables for 64T memory (1G mappings)
> 1 PUD table and 64 PMD tables for 64G vmemmap (2M mappings)
>
> With default PUD[PMD]_TABLE_SIZE(4K), (128+1+64)*4K=772K
> With PAGE_SIZE(64K) table allocations, (128+1+64)*64K=12352K
>
> 2. 2G system
> ------------
> 2G RAM would need 2M for vmemmap with struct page size being 64B.
>
> 1 PUD table for 2G memory (1G mapping)
> 1 PUD table and 1 PMD table for 2M vmemmap (2M mappings)
>
> With default PUD[PMD]_TABLE_SIZE(4K), (1+1+1)*4K=12K
> With new PAGE_SIZE(64K) table allocations, (1+1+1)*64K=192K
How about we just do
void pmd_fragment_free(unsigned long *pmd)
{
struct page *page = virt_to_page(pmd);
/*
* Early pmd pages allocated via memblock
* allocator need to be freed differently
*/
if (PageReserved(page))
return free_reserved_page(page);
BUG_ON(atomic_read(&page->pt_frag_refcount) <= 0);
if (atomic_dec_and_test(&page->pt_frag_refcount)) {
pgtable_pmd_page_dtor(page);
__free_page(page);
}
}
That way we could avoid the fixup_pgtable_fragments completely?
>
> Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
> ---
> arch/powerpc/include/asm/book3s/64/pgalloc.h | 11 ++-
> arch/powerpc/include/asm/book3s/64/radix.h | 1 +
> arch/powerpc/include/asm/sparsemem.h | 1 +
> arch/powerpc/mm/book3s64/pgtable.c | 31 +++++++-
> arch/powerpc/mm/book3s64/radix_pgtable.c | 80 +++++++++++++++++++-
> arch/powerpc/mm/mem.c | 5 ++
> arch/powerpc/mm/pgtable-frag.c | 9 ++-
> 7 files changed, 129 insertions(+), 9 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/book3s/64/pgalloc.h b/arch/powerpc/include/asm/book3s/64/pgalloc.h
> index 69c5b051734f..56d695f0095c 100644
> --- a/arch/powerpc/include/asm/book3s/64/pgalloc.h
> +++ b/arch/powerpc/include/asm/book3s/64/pgalloc.h
> @@ -109,7 +109,16 @@ static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
>
> static inline void pud_free(struct mm_struct *mm, pud_t *pud)
> {
> - kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
> + struct page *page = virt_to_page(pud);
> +
> + /*
> + * Early pud pages allocated via memblock allocator
> + * can't be directly freed to slab
> + */
> + if (PageReserved(page))
> + free_reserved_page(page);
> + else
> + kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
> }
>
> static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
> diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
> index 0cba794c4fb8..90f05d52f46d 100644
> --- a/arch/powerpc/include/asm/book3s/64/radix.h
> +++ b/arch/powerpc/include/asm/book3s/64/radix.h
> @@ -297,6 +297,7 @@ static inline unsigned long radix__get_tree_size(void)
> int radix__create_section_mapping(unsigned long start, unsigned long end,
> int nid, pgprot_t prot);
> int radix__remove_section_mapping(unsigned long start, unsigned long end);
> +void radix__fixup_pgtable_fragments(void);
> #endif /* CONFIG_MEMORY_HOTPLUG */
> #endif /* __ASSEMBLY__ */
> #endif
> diff --git a/arch/powerpc/include/asm/sparsemem.h b/arch/powerpc/include/asm/sparsemem.h
> index c89b32443cff..d0b22a937a7a 100644
> --- a/arch/powerpc/include/asm/sparsemem.h
> +++ b/arch/powerpc/include/asm/sparsemem.h
> @@ -16,6 +16,7 @@
> extern int create_section_mapping(unsigned long start, unsigned long end,
> int nid, pgprot_t prot);
> extern int remove_section_mapping(unsigned long start, unsigned long end);
> +void fixup_pgtable_fragments(void);
>
> #ifdef CONFIG_PPC_BOOK3S_64
> extern int resize_hpt_for_hotplug(unsigned long new_mem_size);
> diff --git a/arch/powerpc/mm/book3s64/pgtable.c b/arch/powerpc/mm/book3s64/pgtable.c
> index c58ad1049909..ee94a28dc6f9 100644
> --- a/arch/powerpc/mm/book3s64/pgtable.c
> +++ b/arch/powerpc/mm/book3s64/pgtable.c
> @@ -184,6 +184,13 @@ int __meminit remove_section_mapping(unsigned long start, unsigned long end)
>
> return hash__remove_section_mapping(start, end);
> }
> +
> +void fixup_pgtable_fragments(void)
> +{
> + if (radix_enabled())
> + radix__fixup_pgtable_fragments();
> +}
> +
> #endif /* CONFIG_MEMORY_HOTPLUG */
>
> void __init mmu_partition_table_init(void)
> @@ -341,13 +348,23 @@ void pmd_fragment_free(unsigned long *pmd)
>
> BUG_ON(atomic_read(&page->pt_frag_refcount) <= 0);
> if (atomic_dec_and_test(&page->pt_frag_refcount)) {
> - pgtable_pmd_page_dtor(page);
> - __free_page(page);
> + /*
> + * Early pmd pages allocated via memblock
> + * allocator wouldn't have called _ctor
> + */
> + if (PageReserved(page))
> + free_reserved_page(page);
> + else {
> + pgtable_pmd_page_dtor(page);
> + __free_page(page);
> + }
> }
> }
>
> static inline void pgtable_free(void *table, int index)
> {
> + struct page *page;
> +
> switch (index) {
> case PTE_INDEX:
> pte_fragment_free(table, 0);
> @@ -356,7 +373,15 @@ static inline void pgtable_free(void *table, int index)
> pmd_fragment_free(table);
> break;
> case PUD_INDEX:
> - kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), table);
> + page = virt_to_page(table);
> + /*
> + * Early pud pages allocated via memblock
> + * allocator need to be freed differently
> + */
> + if (PageReserved(page))
> + free_reserved_page(page);
> + else
> + kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), table);
> break;
> #if defined(CONFIG_PPC_4K_PAGES) && defined(CONFIG_HUGETLB_PAGE)
> /* 16M hugepd directory at pud level */
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index ffccfe00ca2a..58e42393d5e8 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -37,6 +37,71 @@
> unsigned int mmu_pid_bits;
> unsigned int mmu_base_pid;
>
> +static void fixup_pte_fragments(pmd_t *pmd)
> +{
> + int i;
> +
> + for (i = 0; i < PTRS_PER_PMD; i++, pmd++) {
> + pte_t *pte;
> + struct page *page;
> +
> + if (pmd_none(*pmd))
> + continue;
> + if (pmd_is_leaf(*pmd))
> + continue;
> +
> + pte = pte_offset_kernel(pmd, 0);
> + page = virt_to_page(pte);
> + atomic_inc(&page->pt_frag_refcount);
> + }
> +}
> +
> +static void fixup_pmd_fragments(pud_t *pud)
> +{
> + int i;
> +
> + for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
> + pmd_t *pmd;
> + struct page *page;
> +
> + if (pud_none(*pud))
> + continue;
> + if (pud_is_leaf(*pud))
> + continue;
> +
> + pmd = pmd_offset(pud, 0);
> + page = virt_to_page(pmd);
> + atomic_inc(&page->pt_frag_refcount);
> + fixup_pte_fragments(pmd);
> + }
> +}
> +
> +/*
> + * Walk the init_mm page tables and fixup the PMD and PTE fragment
> + * counts. This allows the PUD, PMD and PTE pages to be freed
> + * back to buddy allocator properly during memory unplug.
> + */
> +void radix__fixup_pgtable_fragments(void)
> +{
> + int i;
> + pgd_t *pgd = pgd_offset_k(0UL);
> +
> + spin_lock(&init_mm.page_table_lock);
> + for (i = 0; i < PTRS_PER_PGD; i++, pgd++) {
> + p4d_t *p4d = p4d_offset(pgd, 0UL);
> + pud_t *pud;
> +
> + if (p4d_none(*p4d))
> + continue;
> + if (p4d_is_leaf(*p4d))
> + continue;
> +
> + pud = pud_offset(p4d, 0);
> + fixup_pmd_fragments(pud);
> + }
> + spin_unlock(&init_mm.page_table_lock);
> +}
> +
> static __ref void *early_alloc_pgtable(unsigned long size, int nid,
> unsigned long region_start, unsigned long region_end)
> {
> @@ -58,6 +123,13 @@ static __ref void *early_alloc_pgtable(unsigned long size, int nid,
> return ptr;
> }
>
> +/*
> + * When allocating pud or pmd pointers, we allocate a complete page
> + * of PAGE_SIZE rather than PUD_TABLE_SIZE or PMD_TABLE_SIZE. This
> + * is to ensure that the page obtained from the memblock allocator
> + * can be completely used as page table page and can be freed
> + * correctly when the page table entries are removed.
> + */
> static int early_map_kernel_page(unsigned long ea, unsigned long pa,
> pgprot_t flags,
> unsigned int map_page_size,
> @@ -74,8 +146,8 @@ static int early_map_kernel_page(unsigned long ea, unsigned long pa,
> pgdp = pgd_offset_k(ea);
> p4dp = p4d_offset(pgdp, ea);
> if (p4d_none(*p4dp)) {
> - pudp = early_alloc_pgtable(PUD_TABLE_SIZE, nid,
> - region_start, region_end);
> + pudp = early_alloc_pgtable(PAGE_SIZE, nid,
> + region_start, region_end);
> p4d_populate(&init_mm, p4dp, pudp);
> }
> pudp = pud_offset(p4dp, ea);
> @@ -84,8 +156,8 @@ static int early_map_kernel_page(unsigned long ea, unsigned long pa,
> goto set_the_pte;
> }
> if (pud_none(*pudp)) {
> - pmdp = early_alloc_pgtable(PMD_TABLE_SIZE, nid,
> - region_start, region_end);
> + pmdp = early_alloc_pgtable(PAGE_SIZE, nid, region_start,
> + region_end);
> pud_populate(&init_mm, pudp, pmdp);
> }
> pmdp = pmd_offset(pudp, ea);
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 5f7fe13211e9..b8ea004c3ebf 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -54,6 +54,10 @@
>
> #include <mm/mmu_decl.h>
>
> +void __weak fixup_pgtable_fragments(void)
> +{
> +}
> +
> #ifndef CPU_FTR_COHERENT_ICACHE
> #define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
> #define CPU_FTR_NOEXECUTE 0
> @@ -301,6 +305,7 @@ void __init mem_init(void)
>
> memblock_free_all();
>
> + fixup_pgtable_fragments();
> #ifdef CONFIG_HIGHMEM
> {
> unsigned long pfn, highmem_mapnr;
> diff --git a/arch/powerpc/mm/pgtable-frag.c b/arch/powerpc/mm/pgtable-frag.c
> index ee4bd6d38602..16213c09896a 100644
> --- a/arch/powerpc/mm/pgtable-frag.c
> +++ b/arch/powerpc/mm/pgtable-frag.c
> @@ -114,6 +114,13 @@ void pte_fragment_free(unsigned long *table, int kernel)
> if (atomic_dec_and_test(&page->pt_frag_refcount)) {
> if (!kernel)
> pgtable_pte_page_dtor(page);
> - __free_page(page);
> + /*
> + * Early pte pages allocated via memblock
> + * allocator need to be freed differently
> + */
> + if (PageReserved(page))
> + free_reserved_page(page);
> + else
> + __free_page(page);
> }
> }
> --
> 2.21.3
^ permalink raw reply
* Re: [PATCH v1 1/3] powerpc/mm/radix: Create separate mappings for hot-plugged memory
From: Aneesh Kumar K.V @ 2020-06-23 10:31 UTC (permalink / raw)
To: Bharata B Rao, linuxppc-dev; +Cc: npiggin, Bharata B Rao
In-Reply-To: <20200623073017.1951-2-bharata@linux.ibm.com>
Bharata B Rao <bharata@linux.ibm.com> writes:
> Memory that gets hot-plugged _during_ boot (and not the memory
> that gets plugged in after boot), is mapped with 1G mappings
> and will undergo splitting when it is unplugged. The splitting
> code has a few issues:
>
> 1. Recursive locking
> --------------------
> Memory unplug path takes cpu_hotplug_lock and calls stop_machine()
> for splitting the mappings. However stop_machine() takes
> cpu_hotplug_lock again causing deadlock.
>
> 2. BUG: sleeping function called from in_atomic() context
> ---------------------------------------------------------
> Memory unplug path (remove_pagetable) takes init_mm.page_table_lock
> spinlock and later calls stop_machine() which does wait_for_completion()
>
> 3. Bad unlock unbalance
> -----------------------
> Memory unplug path takes init_mm.page_table_lock spinlock and calls
> stop_machine(). The stop_machine thread function runs in a different
> thread context (migration thread) which tries to release and reaquire
> ptl. Releasing ptl from a different thread than which acquired it
> causes bad unlock unbalance.
>
> These problems can be avoided if we avoid mapping hot-plugged memory
> with 1G mapping, thereby removing the need for splitting them during
> unplug. Hence, during radix init, identify the hot-plugged memory region
> and create separate mappings for each LMB so that they don't get mapped
> with 1G mappings. The identification of hot-plugged memory has become
> possible after the commit b6eca183e23e ("powerpc/kernel: Enables memory
> hot-remove after reboot on pseries guests").
>
> To create separate mappings for every LMB in the hot-plugged
> region, we need lmb-size for which we use memory_block_size_bytes().
> Since this is early init time code, the machine type isn't probed yet
> and hence memory_block_size_bytes() would return the default LMB size
> as 16MB. Hence we end up issuing more number of mapping requests
> than earlier.
Considering we can split 1G pages correctly, we can avoid doing this?
>
> Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
> ---
> arch/powerpc/mm/book3s64/radix_pgtable.c | 15 ++++++++++++---
> 1 file changed, 12 insertions(+), 3 deletions(-)
>
> diff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c
> index 8acb96de0e48..ffccfe00ca2a 100644
> --- a/arch/powerpc/mm/book3s64/radix_pgtable.c
> +++ b/arch/powerpc/mm/book3s64/radix_pgtable.c
> @@ -16,6 +16,7 @@
> #include <linux/hugetlb.h>
> #include <linux/string_helpers.h>
> #include <linux/stop_machine.h>
> +#include <linux/memory.h>
>
> #include <asm/pgtable.h>
> #include <asm/pgalloc.h>
> @@ -320,6 +321,8 @@ static void __init radix_init_pgtable(void)
> {
> unsigned long rts_field;
> struct memblock_region *reg;
> + phys_addr_t addr;
> + u64 lmb_size = memory_block_size_bytes();
>
> /* We don't support slb for radix */
> mmu_slb_size = 0;
> @@ -338,9 +341,15 @@ static void __init radix_init_pgtable(void)
> continue;
> }
>
> - WARN_ON(create_physical_mapping(reg->base,
> - reg->base + reg->size,
> - -1, PAGE_KERNEL));
> + if (memblock_is_hotpluggable(reg)) {
> + for (addr = reg->base; addr < (reg->base + reg->size);
> + addr += lmb_size)
> + WARN_ON(create_physical_mapping(addr,
> + addr + lmb_size, -1, PAGE_KERNEL));
> + } else
> + WARN_ON(create_physical_mapping(reg->base,
> + reg->base + reg->size,
> + -1, PAGE_KERNEL));
> }
>
> /* Find out how many PID bits are supported */
> --
> 2.21.3
^ permalink raw reply
* [PATCH v2] hmi: Move hmi irq stat from percpu variable to paca.
From: Mahesh Salgaonkar @ 2020-06-23 10:27 UTC (permalink / raw)
To: linuxppc-dev; +Cc: Aneesh Kumar K.V, Nicholas Piggin
With the proposed change in percpu bootmem allocator to use page mapping
[1], the percpu first chunk memory area can come from vmalloc ranges. This
makes hmi handler to crash the kernel whenever percpu variable is accessed
in real mode. This patch fixes this issue by moving the hmi irq stat
inside paca for safe access in realmode.
[1] https://lore.kernel.org/linuxppc-dev/20200608070904.387440-1-aneesh.kumar@linux.ibm.com/
Suggested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.ibm.com>
---
Machine check handling as well touches percpu variables in realmode. Will
address that in separate patchset.
Change in v2:
- Fix the build failures for pmac32 and ppc64e configs.
---
arch/powerpc/include/asm/hardirq.h | 1 -
arch/powerpc/include/asm/paca.h | 1 +
arch/powerpc/kernel/irq.c | 8 ++++++--
arch/powerpc/kernel/mce.c | 2 +-
arch/powerpc/kvm/book3s_hv_ras.c | 2 +-
5 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/include/asm/hardirq.h b/arch/powerpc/include/asm/hardirq.h
index f1e9067bd5ac..f133b5930ae1 100644
--- a/arch/powerpc/include/asm/hardirq.h
+++ b/arch/powerpc/include/asm/hardirq.h
@@ -13,7 +13,6 @@ typedef struct {
unsigned int pmu_irqs;
unsigned int mce_exceptions;
unsigned int spurious_irqs;
- unsigned int hmi_exceptions;
unsigned int sreset_irqs;
#ifdef CONFIG_PPC_WATCHDOG
unsigned int soft_nmi_irqs;
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index 45a839a7c6cf..cc07c399306e 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -225,6 +225,7 @@ struct paca_struct {
u16 in_mce;
u8 hmi_event_available; /* HMI event is available */
u8 hmi_p9_special_emu; /* HMI P9 special emulation */
+ u32 hmi_irqs; /* HMI irq stat */
#endif
u8 ftrace_enabled; /* Hard disable ftrace */
diff --git a/arch/powerpc/kernel/irq.c b/arch/powerpc/kernel/irq.c
index 112d150354b2..a05f9ce05459 100644
--- a/arch/powerpc/kernel/irq.c
+++ b/arch/powerpc/kernel/irq.c
@@ -621,13 +621,15 @@ int arch_show_interrupts(struct seq_file *p, int prec)
seq_printf(p, "%10u ", per_cpu(irq_stat, j).mce_exceptions);
seq_printf(p, " Machine check exceptions\n");
+#ifdef CONFIG_PPC_BOOK3S_64
if (cpu_has_feature(CPU_FTR_HVMODE)) {
seq_printf(p, "%*s: ", prec, "HMI");
for_each_online_cpu(j)
seq_printf(p, "%10u ",
- per_cpu(irq_stat, j).hmi_exceptions);
+ paca_ptrs[j]->hmi_irqs);
seq_printf(p, " Hypervisor Maintenance Interrupts\n");
}
+#endif
seq_printf(p, "%*s: ", prec, "NMI");
for_each_online_cpu(j)
@@ -665,7 +667,9 @@ u64 arch_irq_stat_cpu(unsigned int cpu)
sum += per_cpu(irq_stat, cpu).mce_exceptions;
sum += per_cpu(irq_stat, cpu).spurious_irqs;
sum += per_cpu(irq_stat, cpu).timer_irqs_others;
- sum += per_cpu(irq_stat, cpu).hmi_exceptions;
+#ifdef CONFIG_PPC_BOOK3S_64
+ sum += paca_ptrs[cpu]->hmi_irqs;
+#endif
sum += per_cpu(irq_stat, cpu).sreset_irqs;
#ifdef CONFIG_PPC_WATCHDOG
sum += per_cpu(irq_stat, cpu).soft_nmi_irqs;
diff --git a/arch/powerpc/kernel/mce.c b/arch/powerpc/kernel/mce.c
index fd90c0eda229..dc11fc16750f 100644
--- a/arch/powerpc/kernel/mce.c
+++ b/arch/powerpc/kernel/mce.c
@@ -711,7 +711,7 @@ long hmi_exception_realmode(struct pt_regs *regs)
{
int ret;
- __this_cpu_inc(irq_stat.hmi_exceptions);
+ local_paca->hmi_irqs++;
ret = hmi_handle_debugtrig(regs);
if (ret >= 0)
diff --git a/arch/powerpc/kvm/book3s_hv_ras.c b/arch/powerpc/kvm/book3s_hv_ras.c
index 79f7d07ef674..6028628ea3ac 100644
--- a/arch/powerpc/kvm/book3s_hv_ras.c
+++ b/arch/powerpc/kvm/book3s_hv_ras.c
@@ -244,7 +244,7 @@ long kvmppc_realmode_hmi_handler(void)
{
bool resync_req;
- __this_cpu_inc(irq_stat.hmi_exceptions);
+ local_paca->hmi_irqs++;
if (hmi_handle_debugtrig(NULL) >= 0)
return 1;
^ permalink raw reply related
* Re: [PATCH v4 0/7] clean up redundant 'kvm_run' parameters
From: Paolo Bonzini @ 2020-06-23 10:24 UTC (permalink / raw)
To: Tianjia Zhang, tsbogend, paulus, mpe, benh, borntraeger, frankja,
david, cohuck, heiko.carstens, gor, sean.j.christopherson,
vkuznets, wanpengli, jmattson, joro, tglx, mingo, bp, x86, hpa,
maz, james.morse, julien.thierry.kdev, suzuki.poulose,
christoffer.dall, peterx, thuth, chenhuacai
Cc: linux-s390, kvm, linux-mips, kvm-ppc, linux-kernel, linuxppc-dev,
kvmarm, linux-arm-kernel
In-Reply-To: <3a2bee8b-20b4-5d33-7d12-09c374a5afde@linux.alibaba.com>
On 23/06/20 12:00, Tianjia Zhang wrote:
>
>
> On 2020/6/23 17:42, Paolo Bonzini wrote:
>> On 27/04/20 06:35, Tianjia Zhang wrote:
>>> In the current kvm version, 'kvm_run' has been included in the
>>> 'kvm_vcpu'
>>> structure. For historical reasons, many kvm-related function parameters
>>> retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. This
>>> patch does a unified cleanup of these remaining redundant parameters.
>>>
>>> This series of patches has completely cleaned the architecture of
>>> arm64, mips, ppc, and s390 (no such redundant code on x86). Due to
>>> the large number of modified codes, a separate patch is made for each
>>> platform. On the ppc platform, there is also a redundant structure
>>> pointer of 'kvm_run' in 'vcpu_arch', which has also been cleaned
>>> separately.
>>
>> Tianjia, can you please refresh the patches so that each architecture
>> maintainer can pick them up? Thanks very much for this work!
>>
>> Paolo
>>
>
> No problem, this is what I should do.
> After I update, do I submit separately for each architecture or submit
> them together in a patchset?
You can send them together.
Paolo
^ permalink raw reply
* Re: [PATCH v4 0/7] clean up redundant 'kvm_run' parameters
From: Tianjia Zhang @ 2020-06-23 10:00 UTC (permalink / raw)
To: Paolo Bonzini, tsbogend, paulus, mpe, benh, borntraeger, frankja,
david, cohuck, heiko.carstens, gor, sean.j.christopherson,
vkuznets, wanpengli, jmattson, joro, tglx, mingo, bp, x86, hpa,
maz, james.morse, julien.thierry.kdev, suzuki.poulose,
christoffer.dall, peterx, thuth, chenhuacai
Cc: linux-s390, kvm, linux-mips, kvm-ppc, linux-kernel, linuxppc-dev,
kvmarm, linux-arm-kernel
In-Reply-To: <fe463233-d094-fca5-b4e9-c1d97124fd69@redhat.com>
On 2020/6/23 17:42, Paolo Bonzini wrote:
> On 27/04/20 06:35, Tianjia Zhang wrote:
>> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
>> structure. For historical reasons, many kvm-related function parameters
>> retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. This
>> patch does a unified cleanup of these remaining redundant parameters.
>>
>> This series of patches has completely cleaned the architecture of
>> arm64, mips, ppc, and s390 (no such redundant code on x86). Due to
>> the large number of modified codes, a separate patch is made for each
>> platform. On the ppc platform, there is also a redundant structure
>> pointer of 'kvm_run' in 'vcpu_arch', which has also been cleaned
>> separately.
>
> Tianjia, can you please refresh the patches so that each architecture
> maintainer can pick them up? Thanks very much for this work!
>
> Paolo
>
No problem, this is what I should do.
After I update, do I submit separately for each architecture or submit
them together in a patchset?
Thanks,
Tianjia
^ permalink raw reply
* Re: [PATCH V3 (RESEND) 0/3] arm64: Enable vmemmap mapping from device memory
From: Jia He @ 2020-06-23 7:39 UTC (permalink / raw)
To: Anshuman Khandual, linux-mm
Cc: Mark Rutland, Michal Hocko, linux-ia64, David Hildenbrand,
Peter Zijlstra, Dave Hansen, Paul Mackerras, linux-riscv,
Will Deacon, Thomas Gleixner, x86, Matthew Wilcox (Oracle),
Mike Rapoport, Ingo Molnar, Catalin Marinas, Fenghua Yu,
Pavel Tatashin, Andy Lutomirski, Paul Walmsley, Dan Williams,
linux-arm-kernel, Tony Luck, linux-kernel, Palmer Dabbelt,
Andrew Morton, linuxppc-dev, Kirill A. Shutemov
In-Reply-To: <1592442930-9380-1-git-send-email-anshuman.khandual@arm.com>
[-- Attachment #1: Type: text/plain, Size: 4271 bytes --]
Hi
I also tested the addional cases on arm64
1, 4k page size + devdax + --map=mem
2, 64k page size + devdax + --map=mem
3, 4k page size + devdax + --map=dev
4, 64k page size + devdax + --map=dev
case 4 is important to verify Anshuman's this series.
Host kernel: 5.7-rc3
guest kernel: 5.7-rc5 with this series
ndctl: https://github.com/pmem/ndctl/tree/c7767834871
<https://github.com/pmem/ndctl/tree/c7767834871f7ce50a2abe1da946e9e16fb08eda>
On the guest:
1. ./ndctl/.libs/ndctl create-namespace -e namespace0.0 --mode=devdax --map=dev
-s 1g -f -v -a 64K
echo dax0.0 > /sys/bus/dax/drivers/device_dax/unbind
echo dax0.0 > /sys/bus/dax/drivers/kmem/new_id
The 1g block was added
2. echo 0 > /sys/devices/system/memory/memory10/online
modprobe -r dax_pmem
The 1g block was removed
Some minor fix should be applied which is not relevant to this series itself.
e.g numa id
---
Cheers,
Justin (Jia He)
On 2020/6/18 9:15, Anshuman Khandual wrote:
> This series enables vmemmap backing memory allocation from device memory
> ranges on arm64. But before that, it enables vmemmap_populate_basepages()
> and vmemmap_alloc_block_buf() to accommodate struct vmem_altmap based
> alocation requests.
>
> This series applies on 5.8-rc1.
>
> Pending Question:
>
> altmap_alloc_block_buf() does not have any other remaining users in the
> tree after this change. Should it be converted into a static function and
> it's declaration be dropped from the header (include/linux/mm.h). Avoided
> doing so because I was not sure if there are any off-tree users or not.
>
> Changes in V3:
>
> - Dropped comment from free_hotplug_page_range() per Robin
> - Modified comment in unmap_hotplug_range() per Robin
> - Enabled altmap support in vmemmap_alloc_block_buf() per Robin
>
> Changes in V2: (https://lkml.org/lkml/2020/3/4/475)
>
> - Rebased on latest hot-remove series (v14) adding P4D page table support
>
> Changes in V1: (https://lkml.org/lkml/2020/1/23/12)
>
> - Added an WARN_ON() in unmap_hotplug_range() when altmap is
> provided without the page table backing memory being freed
>
> Changes in RFC V2: (https://lkml.org/lkml/2019/10/21/11)
>
> - Changed the commit message on 1/2 patch per Will
> - Changed the commit message on 2/2 patch as well
> - Rebased on arm64 memory hot remove series (v10)
>
> RFC V1: (https://lkml.org/lkml/2019/6/28/32)
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: Paul Walmsley <paul.walmsley@sifive.com>
> Cc: Palmer Dabbelt <palmer@dabbelt.com>
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: Fenghua Yu <fenghua.yu@intel.com>
> Cc: Dave Hansen <dave.hansen@linux.intel.com>
> Cc: Andy Lutomirski <luto@kernel.org>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: David Hildenbrand <david@redhat.com>
> Cc: Mike Rapoport <rppt@linux.ibm.com>
> Cc: Michal Hocko <mhocko@suse.com>
> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> Cc: Paul Mackerras <paulus@samba.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: linux-arm-kernel@lists.infradead.org
> Cc: linux-ia64@vger.kernel.org
> Cc: linux-riscv@lists.infradead.org
> Cc: x86@kernel.org
> Cc: linuxppc-dev@lists.ozlabs.org
> Cc: linux-mm@kvack.org
> Cc: linux-kernel@vger.kernel.org
>
> Anshuman Khandual (3):
> mm/sparsemem: Enable vmem_altmap support in vmemmap_populate_basepages()
> mm/sparsemem: Enable vmem_altmap support in vmemmap_alloc_block_buf()
> arm64/mm: Enable vmem_altmap support for vmemmap mappings
>
> arch/arm64/mm/mmu.c | 59 ++++++++++++++++++++++++++-------------
> arch/ia64/mm/discontig.c | 2 +-
> arch/powerpc/mm/init_64.c | 10 +++----
> arch/riscv/mm/init.c | 2 +-
> arch/x86/mm/init_64.c | 12 ++++----
> include/linux/mm.h | 8 ++++--
> mm/sparse-vmemmap.c | 38 ++++++++++++++++++++-----
> 7 files changed, 87 insertions(+), 44 deletions(-)
>
--
[-- Attachment #2: Type: text/html, Size: 8976 bytes --]
^ permalink raw reply
* Re: [PATCH 17/17] arch: rename copy_thread_tls() back to copy_thread()
From: Geert Uytterhoeven @ 2020-06-23 7:38 UTC (permalink / raw)
To: Christian Brauner
Cc: Rich Felker, Linux-sh list, Peter Zijlstra (Intel),
Catalin Marinas, open list:BROADCOM NVRAM DRIVER,
James E.J. Bottomley, Max Filippov, Guo Ren,
Matthew Wilcox (Oracle), H. Peter Anvin, sparclinux,
open list:QUALCOMM HEXAGON..., linux-riscv, Vincent Chen,
Will Deacon, Thomas Gleixner, Anton Ivanov, Jonas Bonn,
linux-s390, linux-ia64@vger.kernel.org, linux-c6x-dev, Brian Cain,
open list:TENSILICA XTENSA PORT (xtensa), Helge Deller,
the arch/x86 maintainers, Russell King, Ley Foon Tan,
Christian Borntraeger, Ingo Molnar, Parisc List, Mark Salter,
linux-csky, Matt Turner, arcml,
moderated list:H8/300 ARCHITECTURE, Fenghua Yu, Albert Ou,
Kees Cook, Jeff Dike, alpha, linux-um, linuxppc-dev,
Aurelien Jacquiot, linux-m68k, Thomas Bogendoerfer,
Ivan Kokshaysky, Greentime Hu, Paul Walmsley, Stafford Horne,
Stefan Kristiansson, Guan Xuetao, Linux ARM, Richard Henderson,
Chris Zankel, Michal Simek, Tony Luck, Yoshinori Sato, Nick Hu,
Vineet Gupta, Linux Kernel Mailing List, Openrisc, Palmer Dabbelt,
Richard Weinberger, Paul Mackerras, Linus Torvalds,
David S. Miller, Al Viro
In-Reply-To: <20200622234326.906346-18-christian.brauner@ubuntu.com>
On Tue, Jun 23, 2020 at 1:47 AM Christian Brauner
<christian.brauner@ubuntu.com> wrote:
> Now that HAVE_COPY_THREAD_TLS has been removed, rename copy_thread_tls()
> back simply copy_thread(). It's a simpler name, and doesn't imply that only
> tls is copied here. This finishes an outstanding chunk of internal process
> creation work since we've added clone3().
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
> arch/m68k/kernel/process.c | 2 +-
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply
* Re: [PATCH 16/17] arch: remove HAVE_COPY_THREAD_TLS
From: Geert Uytterhoeven @ 2020-06-23 7:37 UTC (permalink / raw)
To: Christian Brauner
Cc: Rich Felker, Linux-sh list, Peter Zijlstra, Catalin Marinas,
Heiko Carstens, open list:BROADCOM NVRAM DRIVER,
James E.J. Bottomley, Guo Ren, linux-csky, sparclinux,
open list:QUALCOMM HEXAGON..., linux-riscv, Vincent Chen,
Will Deacon, Thomas Gleixner, Anton Ivanov, Jonas Bonn,
linux-s390, linux-ia64@vger.kernel.org, linux-c6x-dev, Brian Cain,
open list:TENSILICA XTENSA PORT (xtensa), Helge Deller,
the arch/x86 maintainers, Russell King, Ley Foon Tan,
Mike Rapoport, Christian Borntraeger, Ingo Molnar, Parisc List,
Mark Salter, Matt Turner, arcml,
moderated list:H8/300 ARCHITECTURE, Fenghua Yu, Albert Ou,
Kees Cook, Vasily Gorbik, Jeff Dike, alpha, linux-um,
linuxppc-dev, Aurelien Jacquiot, linux-m68k, Thomas Bogendoerfer,
Ivan Kokshaysky, Greentime Hu, Paul Walmsley, Stafford Horne,
Stefan Kristiansson, Guan Xuetao, Linux ARM, Richard Henderson,
Michal Simek, Tony Luck, Yoshinori Sato, Nick Hu, Vineet Gupta,
Linux Kernel Mailing List, Openrisc, Palmer Dabbelt,
Richard Weinberger, Paul Mackerras, Linus Torvalds,
David S. Miller, Al Viro
In-Reply-To: <20200622234326.906346-17-christian.brauner@ubuntu.com>
On Tue, Jun 23, 2020 at 1:47 AM Christian Brauner
<christian.brauner@ubuntu.com> wrote:
> All architectures support copy_thread_tls() now, so remove the legacy
> copy_thread() function and the HAVE_COPY_THREAD_TLS config option. Everyone
> uses the same process creation calling convention based on
> copy_thread_tls() and struct kernel_clone_args. This will make it easier to
> maintain the core process creation code under kernel/, simplifies the
> callpaths and makes the identical for all architectures.
> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
> arch/m68k/Kconfig | 1 -
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply
* Re: [PATCH v4 0/7] clean up redundant 'kvm_run' parameters
From: Paolo Bonzini @ 2020-06-23 9:42 UTC (permalink / raw)
To: Tianjia Zhang, tsbogend, paulus, mpe, benh, borntraeger, frankja,
david, cohuck, heiko.carstens, gor, sean.j.christopherson,
vkuznets, wanpengli, jmattson, joro, tglx, mingo, bp, x86, hpa,
maz, james.morse, julien.thierry.kdev, suzuki.poulose,
christoffer.dall, peterx, thuth, chenhuacai
Cc: linux-s390, kvm, linux-mips, kvm-ppc, linux-kernel, linuxppc-dev,
kvmarm, linux-arm-kernel
In-Reply-To: <20200427043514.16144-1-tianjia.zhang@linux.alibaba.com>
On 27/04/20 06:35, Tianjia Zhang wrote:
> In the current kvm version, 'kvm_run' has been included in the 'kvm_vcpu'
> structure. For historical reasons, many kvm-related function parameters
> retain the 'kvm_run' and 'kvm_vcpu' parameters at the same time. This
> patch does a unified cleanup of these remaining redundant parameters.
>
> This series of patches has completely cleaned the architecture of
> arm64, mips, ppc, and s390 (no such redundant code on x86). Due to
> the large number of modified codes, a separate patch is made for each
> platform. On the ppc platform, there is also a redundant structure
> pointer of 'kvm_run' in 'vcpu_arch', which has also been cleaned
> separately.
Tianjia, can you please refresh the patches so that each architecture
maintainer can pick them up? Thanks very much for this work!
Paolo
>
> ---
> v4 change:
> mips: fixes two errors in entry.c.
>
> v3 change:
> Keep the existing `vcpu->run` in the function body unchanged.
>
> v2 change:
> s390 retains the original variable name and minimizes modification.
>
> Tianjia Zhang (7):
> KVM: s390: clean up redundant 'kvm_run' parameters
> KVM: arm64: clean up redundant 'kvm_run' parameters
> KVM: PPC: Remove redundant kvm_run from vcpu_arch
> KVM: PPC: clean up redundant 'kvm_run' parameters
> KVM: PPC: clean up redundant kvm_run parameters in assembly
> KVM: MIPS: clean up redundant 'kvm_run' parameters
> KVM: MIPS: clean up redundant kvm_run parameters in assembly
>
> arch/arm64/include/asm/kvm_coproc.h | 12 +--
> arch/arm64/include/asm/kvm_host.h | 11 +--
> arch/arm64/include/asm/kvm_mmu.h | 2 +-
> arch/arm64/kvm/handle_exit.c | 36 +++----
> arch/arm64/kvm/sys_regs.c | 13 ++-
> arch/mips/include/asm/kvm_host.h | 32 +------
> arch/mips/kvm/emulate.c | 59 ++++--------
> arch/mips/kvm/entry.c | 21 ++---
> arch/mips/kvm/mips.c | 14 +--
> arch/mips/kvm/trap_emul.c | 114 ++++++++++-------------
> arch/mips/kvm/vz.c | 26 ++----
> arch/powerpc/include/asm/kvm_book3s.h | 16 ++--
> arch/powerpc/include/asm/kvm_host.h | 1 -
> arch/powerpc/include/asm/kvm_ppc.h | 27 +++---
> arch/powerpc/kvm/book3s.c | 4 +-
> arch/powerpc/kvm/book3s.h | 2 +-
> arch/powerpc/kvm/book3s_64_mmu_hv.c | 12 +--
> arch/powerpc/kvm/book3s_64_mmu_radix.c | 4 +-
> arch/powerpc/kvm/book3s_emulate.c | 10 +-
> arch/powerpc/kvm/book3s_hv.c | 64 ++++++-------
> arch/powerpc/kvm/book3s_hv_nested.c | 12 +--
> arch/powerpc/kvm/book3s_interrupts.S | 17 ++--
> arch/powerpc/kvm/book3s_paired_singles.c | 72 +++++++-------
> arch/powerpc/kvm/book3s_pr.c | 33 ++++---
> arch/powerpc/kvm/booke.c | 39 ++++----
> arch/powerpc/kvm/booke.h | 8 +-
> arch/powerpc/kvm/booke_emulate.c | 2 +-
> arch/powerpc/kvm/booke_interrupts.S | 9 +-
> arch/powerpc/kvm/bookehv_interrupts.S | 10 +-
> arch/powerpc/kvm/e500_emulate.c | 15 ++-
> arch/powerpc/kvm/emulate.c | 10 +-
> arch/powerpc/kvm/emulate_loadstore.c | 32 +++----
> arch/powerpc/kvm/powerpc.c | 72 +++++++-------
> arch/powerpc/kvm/trace_hv.h | 6 +-
> arch/s390/kvm/kvm-s390.c | 23 +++--
> virt/kvm/arm/arm.c | 6 +-
> virt/kvm/arm/mmio.c | 11 ++-
> virt/kvm/arm/mmu.c | 5 +-
> 38 files changed, 392 insertions(+), 470 deletions(-)
>
^ permalink raw reply
* Re: [cpufreq] d83f959b5e: kmsg.cpufreq:cpufreq_online:Failed_to_initialize_policy_for_cpu:#(-#)
From: Quentin Perret @ 2020-06-23 9:25 UTC (permalink / raw)
To: kernel test robot
Cc: juri.lelli, kernel-team, vincent.guittot, arnd, rafael, peterz,
viresh.kumar, adharmap, linux-pm, rjw, linux-kernel, lkp, mingo,
paulus, linuxppc-dev, tkjos
In-Reply-To: <20200622005457.GI5535@shao2-debian>
Hi,
Thanks for the report.
On Monday 22 Jun 2020 at 08:54:57 (+0800), kernel test robot wrote:
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: d83f959b5e7a6378a4afbff23de2a2d064d95749 ("[PATCH 2/2] cpufreq: Specify default governor on command line")
> url: https://github.com/0day-ci/linux/commits/Quentin-Perret/cpufreq-Specify-the-default-governor-on-command-line/20200616-005920
> base: https://git.kernel.org/cgit/linux/kernel/git/rafael/linux-pm.git linux-next
>
> in testcase: kernel-selftests
> with following parameters:
>
> group: kselftests-x86
> ucode: 0xdc
>
> test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
> test-url: https://www.kernel.org/doc/Documentation/kselftest.txt
>
>
> on test machine: 8 threads Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with 16G memory
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
>
>
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <rong.a.chen@intel.com>
>
>
>
> [ 8.715369] intel_pstate: Intel P-state driver initializing
> [ 8.721146] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 0 (-61)
> [ 8.728900] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 1 (-61)
> [ 8.736615] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 2 (-61)
> [ 8.744400] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 3 (-61)
> [ 8.752222] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 4 (-61)
> [ 8.760010] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 5 (-61)
> [ 8.768077] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 6 (-61)
> [ 8.775891] cpufreq: cpufreq_online: Failed to initialize policy for cpu: 7 (-61)
That, I think, is because of the issue I reported here:
https://lore.kernel.org/lkml/20200615174141.GA235811@google.com/
The v2 (to be posted shortly) will address this.
Thanks,
Quentin
^ permalink raw reply
* Re: [PATCH v4 6/8] arm: Break cyclic percpu include
From: Will Deacon @ 2020-06-23 9:02 UTC (permalink / raw)
To: Peter Zijlstra
Cc: linux-s390, bigeasy, x86, heiko.carstens, linux-kernel, rostedt,
davem, a.darwish, sparclinux, linux, tglx, linuxppc-dev, mingo
In-Reply-To: <20200623083721.454517573@infradead.org>
On Tue, Jun 23, 2020 at 10:36:51AM +0200, Peter Zijlstra wrote:
> In order to use <asm/percpu.h> in irqflags.h, we need to make sure
> asm/percpu.h does not itself depend on irqflags.h.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
> arch/arm/include/asm/percpu.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> --- a/arch/arm/include/asm/percpu.h
> +++ b/arch/arm/include/asm/percpu.h
> @@ -10,6 +10,8 @@
> * in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
> */
> #if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)
> +register unsigned long current_stack_pointer asm ("sp");
If you define this unconditionally, then we can probably get rid of the
copy in asm/thread_info.h, rather than duplicate the same #define.
Will
^ permalink raw reply
* Re: [PATCH v2 1/2] ASoC: fsl_mqs: Don't check clock is NULL before calling clk API
From: Markus Elfring @ 2020-06-23 8:55 UTC (permalink / raw)
To: Shengjiu Wang, alsa-devel, linuxppc-dev
Cc: Timur Tabi, Xiubo Li, Shengjiu Wang, kernel-janitors,
Takashi Iwai, linux-kernel, Nicolin Chen, Mark Brown,
Fabio Estevam
In-Reply-To: <CAA+D8APR2NGAn9jRDSZzr1fgj5u0hAvH19VxZS+tj2A7j3PCuw@mail.gmail.com>
> clk_prepare_enable and clk_disable_unprepare check the input
> clock parameter in the beginning of the function,
These functions call further functions which perform null pointer checks.
> if the parameter
> is NULL, clk_prepare_enable and clk_disable_unprepare will
> return immediately.
The interpretation of these function implementations seems to be reasonable.
Would you like to achieve any improvements for the corresponding software documentation?
> So Don't need to check input clock parameters before calling clk API.
What do you find imperative in this wording?
Another wording alternative:
Thus omit extra null pointer checks before four function calls.
Regards,
Markus
^ permalink raw reply
* [PATCH v4 6/8] arm: Break cyclic percpu include
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
In order to use <asm/percpu.h> in irqflags.h, we need to make sure
asm/percpu.h does not itself depend on irqflags.h.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/arm/include/asm/percpu.h | 2 ++
1 file changed, 2 insertions(+)
--- a/arch/arm/include/asm/percpu.h
+++ b/arch/arm/include/asm/percpu.h
@@ -10,6 +10,8 @@
* in the TPIDRPRW. TPIDRPRW only exists on V6K and V7
*/
#if defined(CONFIG_SMP) && !defined(CONFIG_CPU_V6)
+register unsigned long current_stack_pointer asm ("sp");
+
static inline void set_my_cpu_offset(unsigned long off)
{
/* Set TPIDRPRW */
^ permalink raw reply
* [PATCH v4 5/8] s390: Break cyclic percpu include
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
In order to use <asm/percpu.h> in irqflags.h, we need to make sure
asm/percpu.h does not itself depend on irqflags.h
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/s390/include/asm/smp.h | 1 +
arch/s390/include/asm/thread_info.h | 1 -
2 files changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/include/asm/smp.h
+++ b/arch/s390/include/asm/smp.h
@@ -10,6 +10,7 @@
#include <asm/sigp.h>
#include <asm/lowcore.h>
+#include <asm/processor.h>
#define raw_smp_processor_id() (S390_lowcore.cpu_nr)
--- a/arch/s390/include/asm/thread_info.h
+++ b/arch/s390/include/asm/thread_info.h
@@ -24,7 +24,6 @@
#ifndef __ASSEMBLY__
#include <asm/lowcore.h>
#include <asm/page.h>
-#include <asm/processor.h>
#define STACK_INIT_OFFSET \
(THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs))
^ permalink raw reply
* [PATCH v4 4/8] powerpc64: Break asm/percpu.h vs spinlock_types.h dependency
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
In order to use <asm/percpu.h> in lockdep.h, we need to make sure
asm/percpu.h does not itself depend on lockdep.
The below seems to make that so and builds powerpc64-defconfig +
PROVE_LOCKING.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/powerpc/include/asm/dtl.h | 52 +++++++++++++++++++++++++++++++++
arch/powerpc/include/asm/lppaca.h | 44 ---------------------------
arch/powerpc/include/asm/paca.h | 2 -
arch/powerpc/kernel/time.c | 2 +
arch/powerpc/kvm/book3s_hv.c | 1
arch/powerpc/platforms/pseries/dtl.c | 1
arch/powerpc/platforms/pseries/lpar.c | 1
arch/powerpc/platforms/pseries/setup.c | 1
arch/powerpc/platforms/pseries/svm.c | 1
9 files changed, 60 insertions(+), 45 deletions(-)
--- /dev/null
+++ b/arch/powerpc/include/asm/dtl.h
@@ -0,0 +1,52 @@
+#ifndef _ASM_POWERPC_DTL_H
+#define _ASM_POWERPC_DTL_H
+
+#include <asm/lppaca.h>
+#include <linux/spinlock_types.h>
+
+/*
+ * Layout of entries in the hypervisor's dispatch trace log buffer.
+ */
+struct dtl_entry {
+ u8 dispatch_reason;
+ u8 preempt_reason;
+ __be16 processor_id;
+ __be32 enqueue_to_dispatch_time;
+ __be32 ready_to_enqueue_time;
+ __be32 waiting_to_ready_time;
+ __be64 timebase;
+ __be64 fault_addr;
+ __be64 srr0;
+ __be64 srr1;
+};
+
+#define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
+#define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
+
+/*
+ * Dispatch trace log event enable mask:
+ * 0x1: voluntary virtual processor waits
+ * 0x2: time-slice preempts
+ * 0x4: virtual partition memory page faults
+ */
+#define DTL_LOG_CEDE 0x1
+#define DTL_LOG_PREEMPT 0x2
+#define DTL_LOG_FAULT 0x4
+#define DTL_LOG_ALL (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
+
+extern struct kmem_cache *dtl_cache;
+extern rwlock_t dtl_access_lock;
+
+/*
+ * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
+ * reading from the dispatch trace log. If other code wants to consume
+ * DTL entries, it can set this pointer to a function that will get
+ * called once for each DTL entry that gets processed.
+ */
+extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
+
+extern void register_dtl_buffer(int cpu);
+extern void alloc_dtl_buffers(unsigned long *time_limit);
+extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
+
+#endif /* _ASM_POWERPC_DTL_H */
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -42,7 +42,6 @@
*/
#include <linux/cache.h>
#include <linux/threads.h>
-#include <linux/spinlock_types.h>
#include <asm/types.h>
#include <asm/mmu.h>
#include <asm/firmware.h>
@@ -146,49 +145,6 @@ struct slb_shadow {
} save_area[SLB_NUM_BOLTED];
} ____cacheline_aligned;
-/*
- * Layout of entries in the hypervisor's dispatch trace log buffer.
- */
-struct dtl_entry {
- u8 dispatch_reason;
- u8 preempt_reason;
- __be16 processor_id;
- __be32 enqueue_to_dispatch_time;
- __be32 ready_to_enqueue_time;
- __be32 waiting_to_ready_time;
- __be64 timebase;
- __be64 fault_addr;
- __be64 srr0;
- __be64 srr1;
-};
-
-#define DISPATCH_LOG_BYTES 4096 /* bytes per cpu */
-#define N_DISPATCH_LOG (DISPATCH_LOG_BYTES / sizeof(struct dtl_entry))
-
-/*
- * Dispatch trace log event enable mask:
- * 0x1: voluntary virtual processor waits
- * 0x2: time-slice preempts
- * 0x4: virtual partition memory page faults
- */
-#define DTL_LOG_CEDE 0x1
-#define DTL_LOG_PREEMPT 0x2
-#define DTL_LOG_FAULT 0x4
-#define DTL_LOG_ALL (DTL_LOG_CEDE | DTL_LOG_PREEMPT | DTL_LOG_FAULT)
-
-extern struct kmem_cache *dtl_cache;
-extern rwlock_t dtl_access_lock;
-
-/*
- * When CONFIG_VIRT_CPU_ACCOUNTING_NATIVE = y, the cpu accounting code controls
- * reading from the dispatch trace log. If other code wants to consume
- * DTL entries, it can set this pointer to a function that will get
- * called once for each DTL entry that gets processed.
- */
-extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
-
-extern void register_dtl_buffer(int cpu);
-extern void alloc_dtl_buffers(unsigned long *time_limit);
extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
#endif /* CONFIG_PPC_BOOK3S */
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -29,7 +29,6 @@
#include <asm/hmi.h>
#include <asm/cpuidle.h>
#include <asm/atomic.h>
-#include <asm/rtas-types.h>
#include <asm-generic/mmiowb_types.h>
@@ -53,6 +52,7 @@ extern unsigned int debug_smp_processor_
#define get_slb_shadow() (get_paca()->slb_shadow_ptr)
struct task_struct;
+struct rtas_args;
/*
* Defines the layout of the paca.
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -183,6 +183,8 @@ static inline unsigned long read_spurr(u
#ifdef CONFIG_PPC_SPLPAR
+#include <asm/dtl.h>
+
/*
* Scan the dispatch trace log and count up the stolen time.
* Should be called with interrupts disabled.
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -74,6 +74,7 @@
#include <asm/hw_breakpoint.h>
#include <asm/kvm_book3s_uvmem.h>
#include <asm/ultravisor.h>
+#include <asm/dtl.h>
#include "book3s.h"
--- a/arch/powerpc/platforms/pseries/dtl.c
+++ b/arch/powerpc/platforms/pseries/dtl.c
@@ -12,6 +12,7 @@
#include <asm/smp.h>
#include <linux/uaccess.h>
#include <asm/firmware.h>
+#include <asm/dtl.h>
#include <asm/lppaca.h>
#include <asm/debugfs.h>
#include <asm/plpar_wrappers.h>
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -40,6 +40,7 @@
#include <asm/fadump.h>
#include <asm/asm-prototypes.h>
#include <asm/debugfs.h>
+#include <asm/dtl.h>
#include "pseries.h"
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -70,6 +70,7 @@
#include <asm/idle.h>
#include <asm/swiotlb.h>
#include <asm/svm.h>
+#include <asm/dtl.h>
#include "pseries.h"
#include "../../../../drivers/pci/pci.h"
--- a/arch/powerpc/platforms/pseries/svm.c
+++ b/arch/powerpc/platforms/pseries/svm.c
@@ -11,6 +11,7 @@
#include <asm/svm.h>
#include <asm/swiotlb.h>
#include <asm/ultravisor.h>
+#include <asm/dtl.h>
static int __init init_svm(void)
{
^ permalink raw reply
* [PATCH v4 8/8] lockdep: Remove lockdep_hardirq{s_enabled, _context}() argument
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
Now that the macros use per-cpu data, we no longer need the argument.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/entry/common.c | 2 +-
include/linux/irqflags.h | 8 ++++----
include/linux/lockdep.h | 2 +-
kernel/locking/lockdep.c | 30 +++++++++++++++---------------
kernel/softirq.c | 2 +-
tools/include/linux/irqflags.h | 4 ++--
6 files changed, 24 insertions(+), 24 deletions(-)
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -689,7 +689,7 @@ noinstr void idtentry_exit_user(struct p
noinstr bool idtentry_enter_nmi(struct pt_regs *regs)
{
- bool irq_state = lockdep_hardirqs_enabled(current);
+ bool irq_state = lockdep_hardirqs_enabled();
__nmi_enter();
lockdep_hardirqs_off(CALLER_ADDR0);
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -40,9 +40,9 @@ DECLARE_PER_CPU(int, hardirq_context);
extern void trace_hardirqs_off_finish(void);
extern void trace_hardirqs_on(void);
extern void trace_hardirqs_off(void);
-# define lockdep_hardirq_context(p) (this_cpu_read(hardirq_context))
+# define lockdep_hardirq_context() (this_cpu_read(hardirq_context))
# define lockdep_softirq_context(p) ((p)->softirq_context)
-# define lockdep_hardirqs_enabled(p) (this_cpu_read(hardirqs_enabled))
+# define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
# define lockdep_hardirq_enter() \
do { \
@@ -109,9 +109,9 @@ do { \
# define trace_hardirqs_off_finish() do { } while (0)
# define trace_hardirqs_on() do { } while (0)
# define trace_hardirqs_off() do { } while (0)
-# define lockdep_hardirq_context(p) 0
+# define lockdep_hardirq_context() 0
# define lockdep_softirq_context(p) 0
-# define lockdep_hardirqs_enabled(p) 0
+# define lockdep_hardirqs_enabled() 0
# define lockdep_softirqs_enabled(p) 0
# define lockdep_hardirq_enter() do { } while (0)
# define lockdep_hardirq_threaded() do { } while (0)
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -736,7 +736,7 @@ do { \
# define lockdep_assert_RT_in_threaded_ctx() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- lockdep_hardirq_context(current) && \
+ lockdep_hardirq_context() && \
!(current->hardirq_threaded || current->irq_config), \
"Not in threaded context on PREEMPT_RT as expected\n"); \
} while (0)
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2062,9 +2062,9 @@ print_bad_irq_dependency(struct task_str
pr_warn("-----------------------------------------------------\n");
pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
curr->comm, task_pid_nr(curr),
- lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
+ lockdep_hardirq_context(), hardirq_count() >> HARDIRQ_SHIFT,
curr->softirq_context, softirq_count() >> SOFTIRQ_SHIFT,
- lockdep_hardirqs_enabled(curr),
+ lockdep_hardirqs_enabled(),
curr->softirqs_enabled);
print_lock(next);
@@ -3331,9 +3331,9 @@ print_usage_bug(struct task_struct *curr
pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] takes:\n",
curr->comm, task_pid_nr(curr),
- lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
+ lockdep_hardirq_context(), hardirq_count() >> HARDIRQ_SHIFT,
lockdep_softirq_context(curr), softirq_count() >> SOFTIRQ_SHIFT,
- lockdep_hardirqs_enabled(curr),
+ lockdep_hardirqs_enabled(),
lockdep_softirqs_enabled(curr));
print_lock(this);
@@ -3658,7 +3658,7 @@ void lockdep_hardirqs_on_prepare(unsigne
if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (unlikely(lockdep_hardirqs_enabled(current))) {
+ if (unlikely(lockdep_hardirqs_enabled())) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3686,7 +3686,7 @@ void lockdep_hardirqs_on_prepare(unsigne
* Can't allow enabling interrupts while in an interrupt handler,
* that's general bad form and such. Recursion, limited stack etc..
*/
- if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context(current)))
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context()))
return;
current->hardirq_chain_key = current->curr_chain_key;
@@ -3724,7 +3724,7 @@ void noinstr lockdep_hardirqs_on(unsigne
if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (lockdep_hardirqs_enabled(curr)) {
+ if (lockdep_hardirqs_enabled()) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3783,7 +3783,7 @@ void noinstr lockdep_hardirqs_off(unsign
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
- if (lockdep_hardirqs_enabled(curr)) {
+ if (lockdep_hardirqs_enabled()) {
/*
* We have done an ON -> OFF transition:
*/
@@ -3832,7 +3832,7 @@ void lockdep_softirqs_on(unsigned long i
* usage bit for all held locks, if hardirqs are
* enabled too:
*/
- if (lockdep_hardirqs_enabled(curr))
+ if (lockdep_hardirqs_enabled())
mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ);
lockdep_recursion_finish();
}
@@ -3881,7 +3881,7 @@ mark_usage(struct task_struct *curr, str
*/
if (!hlock->trylock) {
if (hlock->read) {
- if (lockdep_hardirq_context(curr))
+ if (lockdep_hardirq_context())
if (!mark_lock(curr, hlock,
LOCK_USED_IN_HARDIRQ_READ))
return 0;
@@ -3890,7 +3890,7 @@ mark_usage(struct task_struct *curr, str
LOCK_USED_IN_SOFTIRQ_READ))
return 0;
} else {
- if (lockdep_hardirq_context(curr))
+ if (lockdep_hardirq_context())
if (!mark_lock(curr, hlock, LOCK_USED_IN_HARDIRQ))
return 0;
if (curr->softirq_context)
@@ -3928,7 +3928,7 @@ mark_usage(struct task_struct *curr, str
static inline unsigned int task_irq_context(struct task_struct *task)
{
- return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context(task) +
+ return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context() +
LOCK_CHAIN_SOFTIRQ_CONTEXT * !!task->softirq_context;
}
@@ -4021,7 +4021,7 @@ static inline short task_wait_context(st
* Set appropriate wait type for the context; for IRQs we have to take
* into account force_irqthread as that is implied by PREEMPT_RT.
*/
- if (lockdep_hardirq_context(curr)) {
+ if (lockdep_hardirq_context()) {
/*
* Check if force_irqthreads will run us threaded.
*/
@@ -4864,11 +4864,11 @@ static void check_flags(unsigned long fl
return;
if (irqs_disabled_flags(flags)) {
- if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled(current))) {
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled())) {
printk("possible reason: unannotated irqs-off.\n");
}
} else {
- if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled(current))) {
+ if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled())) {
printk("possible reason: unannotated irqs-on.\n");
}
}
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -230,7 +230,7 @@ static inline bool lockdep_softirq_start
{
bool in_hardirq = false;
- if (lockdep_hardirq_context(current)) {
+ if (lockdep_hardirq_context()) {
in_hardirq = true;
lockdep_hardirq_exit();
}
--- a/tools/include/linux/irqflags.h
+++ b/tools/include/linux/irqflags.h
@@ -2,9 +2,9 @@
#ifndef _LIBLOCKDEP_LINUX_TRACE_IRQFLAGS_H_
#define _LIBLOCKDEP_LINUX_TRACE_IRQFLAGS_H_
-# define lockdep_hardirq_context(p) 0
+# define lockdep_hardirq_context() 0
# define lockdep_softirq_context(p) 0
-# define lockdep_hardirqs_enabled(p) 0
+# define lockdep_hardirqs_enabled() 0
# define lockdep_softirqs_enabled(p) 0
# define lockdep_hardirq_enter() do { } while (0)
# define lockdep_hardirq_exit() do { } while (0)
^ permalink raw reply
* [PATCH v4 2/8] x86/entry: Fix NMI vs IRQ state tracking
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
While the nmi_enter() users did
trace_hardirqs_{off_prepare,on_finish}() there was no matching
lockdep_hardirqs_*() calls to complete the picture.
Introduce idtentry_{enter,exit}_nmi() to enable proper IRQ state
tracking across the NMIs.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/x86/entry/common.c | 42 ++++++++++++++++++++++++++++++++++++----
arch/x86/include/asm/idtentry.h | 3 ++
arch/x86/kernel/nmi.c | 9 +++-----
arch/x86/kernel/traps.c | 17 +++++-----------
include/linux/hardirq.h | 28 ++++++++++++++++++--------
5 files changed, 70 insertions(+), 29 deletions(-)
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -550,7 +550,7 @@ SYSCALL_DEFINE0(ni_syscall)
* The return value must be fed into the rcu_exit argument of
* idtentry_exit_cond_rcu().
*/
-bool noinstr idtentry_enter_cond_rcu(struct pt_regs *regs)
+noinstr bool idtentry_enter_cond_rcu(struct pt_regs *regs)
{
if (user_mode(regs)) {
enter_from_user_mode();
@@ -640,7 +640,7 @@ static void idtentry_exit_cond_resched(s
* Counterpart to idtentry_enter_cond_rcu(). The return value of the entry
* function must be fed into the @rcu_exit argument.
*/
-void noinstr idtentry_exit_cond_rcu(struct pt_regs *regs, bool rcu_exit)
+noinstr void idtentry_exit_cond_rcu(struct pt_regs *regs, bool rcu_exit)
{
lockdep_assert_irqs_disabled();
@@ -684,7 +684,7 @@ void noinstr idtentry_exit_cond_rcu(stru
* Invokes enter_from_user_mode() to establish the proper context for
* NOHZ_FULL. Otherwise scheduling on exit would not be possible.
*/
-void noinstr idtentry_enter_user(struct pt_regs *regs)
+noinstr void idtentry_enter_user(struct pt_regs *regs)
{
enter_from_user_mode();
}
@@ -701,13 +701,47 @@ void noinstr idtentry_enter_user(struct
*
* Counterpart to idtentry_enter_user().
*/
-void noinstr idtentry_exit_user(struct pt_regs *regs)
+noinstr void idtentry_exit_user(struct pt_regs *regs)
{
lockdep_assert_irqs_disabled();
prepare_exit_to_usermode(regs);
}
+noinstr bool idtentry_enter_nmi(struct pt_regs *regs)
+{
+ bool irq_state = lockdep_hardirqs_enabled(current);
+
+ __nmi_enter();
+ lockdep_hardirqs_off(CALLER_ADDR0);
+ lockdep_hardirq_enter();
+ rcu_nmi_enter();
+
+ instrumentation_begin();
+ trace_hardirqs_off_finish();
+ ftrace_nmi_enter();
+ instrumentation_end();
+
+ return irq_state;
+}
+
+noinstr void idtentry_exit_nmi(struct pt_regs *regs, bool restore)
+{
+ instrumentation_begin();
+ ftrace_nmi_exit();
+ if (restore) {
+ trace_hardirqs_on_prepare();
+ lockdep_hardirqs_on_prepare(CALLER_ADDR0);
+ }
+ instrumentation_end();
+
+ rcu_nmi_exit();
+ lockdep_hardirq_exit();
+ if (restore)
+ lockdep_hardirqs_on(CALLER_ADDR0);
+ __nmi_exit();
+}
+
#ifdef CONFIG_XEN_PV
#ifndef CONFIG_PREEMPTION
/*
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -16,6 +16,9 @@ void idtentry_exit_user(struct pt_regs *
bool idtentry_enter_cond_rcu(struct pt_regs *regs);
void idtentry_exit_cond_rcu(struct pt_regs *regs, bool rcu_exit);
+bool idtentry_enter_nmi(struct pt_regs *regs);
+void idtentry_exit_nmi(struct pt_regs *regs, bool irq_state);
+
/**
* DECLARE_IDTENTRY - Declare functions for simple IDT entry points
* No error code pushed by hardware
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -330,7 +330,6 @@ static noinstr void default_do_nmi(struc
__this_cpu_write(last_nmi_rip, regs->ip);
instrumentation_begin();
- trace_hardirqs_off_finish();
handled = nmi_handle(NMI_LOCAL, regs);
__this_cpu_add(nmi_stats.normal, handled);
@@ -417,8 +416,6 @@ static noinstr void default_do_nmi(struc
unknown_nmi_error(reason, regs);
out:
- if (regs->flags & X86_EFLAGS_IF)
- trace_hardirqs_on_prepare();
instrumentation_end();
}
@@ -478,6 +475,8 @@ static DEFINE_PER_CPU(unsigned long, nmi
DEFINE_IDTENTRY_RAW(exc_nmi)
{
+ bool irq_state;
+
if (IS_ENABLED(CONFIG_SMP) && arch_cpu_is_offline(smp_processor_id()))
return;
@@ -491,14 +490,14 @@ DEFINE_IDTENTRY_RAW(exc_nmi)
this_cpu_write(nmi_dr7, local_db_save());
- nmi_enter();
+ irq_state = idtentry_enter_nmi(regs);
inc_irq_stat(__nmi_count);
if (!ignore_nmis)
default_do_nmi(regs);
- nmi_exit();
+ idtentry_exit_nmi(regs, irq_state);
local_db_restore(this_cpu_read(nmi_dr7));
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -403,7 +403,7 @@ DEFINE_IDTENTRY_DF(exc_double_fault)
}
#endif
- nmi_enter();
+ idtentry_enter_nmi(regs);
instrumentation_begin();
notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_DF, SIGSEGV);
@@ -649,15 +649,12 @@ DEFINE_IDTENTRY_RAW(exc_int3)
instrumentation_end();
idtentry_exit_user(regs);
} else {
- nmi_enter();
+ bool irq_state = idtentry_enter_nmi(regs);
instrumentation_begin();
- trace_hardirqs_off_finish();
if (!do_int3(regs))
die("int3", regs, 0);
- if (regs->flags & X86_EFLAGS_IF)
- trace_hardirqs_on_prepare();
instrumentation_end();
- nmi_exit();
+ idtentry_exit_nmi(regs, irq_state);
}
}
@@ -865,9 +862,8 @@ static void handle_debug(struct pt_regs
static __always_inline void exc_debug_kernel(struct pt_regs *regs,
unsigned long dr6)
{
- nmi_enter();
+ bool irq_state = idtentry_enter_nmi(regs);
instrumentation_begin();
- trace_hardirqs_off_finish();
/*
* Catch SYSENTER with TF set and clear DR_STEP. If this hit a
@@ -878,10 +874,8 @@ static __always_inline void exc_debug_ke
handle_debug(regs, dr6, false);
- if (regs->flags & X86_EFLAGS_IF)
- trace_hardirqs_on_prepare();
instrumentation_end();
- nmi_exit();
+ idtentry_exit_nmi(regs, irq_state);
}
static __always_inline void exc_debug_user(struct pt_regs *regs,
@@ -891,6 +885,7 @@ static __always_inline void exc_debug_us
instrumentation_begin();
handle_debug(regs, dr6, true);
+
instrumentation_end();
idtentry_exit_user(regs);
}
--- a/include/linux/hardirq.h
+++ b/include/linux/hardirq.h
@@ -111,32 +111,42 @@ extern void rcu_nmi_exit(void);
/*
* nmi_enter() can nest up to 15 times; see NMI_BITS.
*/
-#define nmi_enter() \
+#define __nmi_enter() \
do { \
+ lockdep_off(); \
arch_nmi_enter(); \
printk_nmi_enter(); \
- lockdep_off(); \
BUG_ON(in_nmi() == NMI_MASK); \
__preempt_count_add(NMI_OFFSET + HARDIRQ_OFFSET); \
- rcu_nmi_enter(); \
+ } while (0)
+
+#define nmi_enter() \
+ do { \
+ __nmi_enter(); \
lockdep_hardirq_enter(); \
+ rcu_nmi_enter(); \
instrumentation_begin(); \
ftrace_nmi_enter(); \
instrumentation_end(); \
} while (0)
+#define __nmi_exit() \
+ do { \
+ BUG_ON(!in_nmi()); \
+ __preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
+ printk_nmi_exit(); \
+ arch_nmi_exit(); \
+ lockdep_on(); \
+ } while (0)
+
#define nmi_exit() \
do { \
instrumentation_begin(); \
ftrace_nmi_exit(); \
instrumentation_end(); \
- lockdep_hardirq_exit(); \
rcu_nmi_exit(); \
- BUG_ON(!in_nmi()); \
- __preempt_count_sub(NMI_OFFSET + HARDIRQ_OFFSET); \
- lockdep_on(); \
- printk_nmi_exit(); \
- arch_nmi_exit(); \
+ lockdep_hardirq_exit(); \
+ __nmi_exit(); \
} while (0)
#endif /* LINUX_HARDIRQ_H */
^ permalink raw reply
* [PATCH v4 1/8] lockdep: Prepare for NMI IRQ state tracking
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
There is no reason not to always, accurately, track IRQ state.
This change also makes IRQ state tracking ignore lockdep_off().
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
kernel/locking/lockdep.c | 44 +++++++++++++++++++++++++++++++++++++++++---
1 file changed, 41 insertions(+), 3 deletions(-)
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -3646,7 +3646,16 @@ static void __trace_hardirqs_on_caller(v
*/
void lockdep_hardirqs_on_prepare(unsigned long ip)
{
- if (unlikely(!debug_locks || current->lockdep_recursion))
+ if (unlikely(!debug_locks))
+ return;
+
+ /*
+ * NMIs do not (and cannot) track lock dependencies, nothing to do.
+ */
+ if (unlikely(in_nmi()))
+ return;
+
+ if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
if (unlikely(current->hardirqs_enabled)) {
@@ -3692,7 +3701,27 @@ void noinstr lockdep_hardirqs_on(unsigne
{
struct task_struct *curr = current;
- if (unlikely(!debug_locks || curr->lockdep_recursion))
+ if (unlikely(!debug_locks))
+ return;
+
+ /*
+ * NMIs can happen in the middle of local_irq_{en,dis}able() where the
+ * tracking state and hardware state are out of sync.
+ *
+ * NMIs must save lockdep_hardirqs_enabled() to restore IRQ state from,
+ * and not rely on hardware state like normal interrupts.
+ */
+ if (unlikely(in_nmi())) {
+ /*
+ * Skip:
+ * - recursion check, because NMI can hit lockdep;
+ * - hardware state check, because above;
+ * - chain_key check, see lockdep_hardirqs_on_prepare().
+ */
+ goto skip_checks;
+ }
+
+ if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
if (curr->hardirqs_enabled) {
@@ -3720,6 +3749,7 @@ void noinstr lockdep_hardirqs_on(unsigne
DEBUG_LOCKS_WARN_ON(current->hardirq_chain_key !=
current->curr_chain_key);
+skip_checks:
/* we'll do an OFF -> ON transition: */
curr->hardirqs_enabled = 1;
curr->hardirq_enable_ip = ip;
@@ -3735,7 +3765,15 @@ void noinstr lockdep_hardirqs_off(unsign
{
struct task_struct *curr = current;
- if (unlikely(!debug_locks || curr->lockdep_recursion))
+ if (unlikely(!debug_locks))
+ return;
+
+ /*
+ * Matching lockdep_hardirqs_on(), allow NMIs in the middle of lockdep;
+ * they will restore the software state. This ensures the software
+ * state is consistent inside NMIs as well.
+ */
+ if (unlikely(!in_nmi() && (current->lockdep_recursion & LOCKDEP_RECURSION_MASK)))
return;
/*
^ permalink raw reply
* [PATCH v4 3/8] sparc64: Fix asm/percpu.h build error
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
In order to break a header dependency between lockdep and task_struct,
I need per-cpu stuff from lockdep.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
arch/sparc/include/asm/percpu_64.h | 2 ++
arch/sparc/include/asm/trap_block.h | 2 ++
2 files changed, 4 insertions(+)
--- a/arch/sparc/include/asm/percpu_64.h
+++ b/arch/sparc/include/asm/percpu_64.h
@@ -4,7 +4,9 @@
#include <linux/compiler.h>
+#ifndef BUILD_VDSO
register unsigned long __local_per_cpu_offset asm("g5");
+#endif
#ifdef CONFIG_SMP
--- a/arch/sparc/include/asm/trap_block.h
+++ b/arch/sparc/include/asm/trap_block.h
@@ -2,6 +2,8 @@
#ifndef _SPARC_TRAP_BLOCK_H
#define _SPARC_TRAP_BLOCK_H
+#include <linux/threads.h>
+
#include <asm/hypervisor.h>
#include <asm/asi.h>
^ permalink raw reply
* [PATCH v4 0/8] lockdep: Change IRQ state tracking to use per-cpu variables
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
Ahmed and Sebastian wanted additional lockdep_assert*() macros and ran into
header hell. I figured using per-cpu variables would cure that, and also
ran into header hell, still tracktable though.
By moving the IRQ state into per-cpu variables we remove the dependency on
task_struct.
Patches go on top of anything recent I think, an actual git tree with them
in is (for now) here:
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/irqstate
Which 0day blessed with 0 build fails.
^ permalink raw reply
* [PATCH v4 7/8] lockdep: Change hardirq{s_enabled, _context} to per-cpu variables
From: Peter Zijlstra @ 2020-06-23 8:36 UTC (permalink / raw)
To: mingo, will, tglx
Cc: linux-s390, peterz, bigeasy, x86, heiko.carstens, linux-kernel,
rostedt, linux, a.darwish, sparclinux, linuxppc-dev, davem
In-Reply-To: <20200623083645.277342609@infradead.org>
Currently all IRQ-tracking state is in task_struct, this means that
task_struct needs to be defined before we use it.
Especially for lockdep_assert_irq*() this can lead to header-hell.
Move the hardirq state into per-cpu variables to avoid the task_struct
dependency.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
include/linux/irqflags.h | 19 ++++++++++++-------
include/linux/lockdep.h | 34 ++++++++++++++++++----------------
include/linux/sched.h | 2 --
kernel/fork.c | 4 +---
kernel/locking/lockdep.c | 30 +++++++++++++++---------------
kernel/softirq.c | 6 ++++++
6 files changed, 52 insertions(+), 43 deletions(-)
--- a/include/linux/irqflags.h
+++ b/include/linux/irqflags.h
@@ -14,6 +14,7 @@
#include <linux/typecheck.h>
#include <asm/irqflags.h>
+#include <asm/percpu.h>
/* Currently lockdep_softirqs_on/off is used only by lockdep */
#ifdef CONFIG_PROVE_LOCKING
@@ -31,18 +32,22 @@
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
+
+DECLARE_PER_CPU(int, hardirqs_enabled);
+DECLARE_PER_CPU(int, hardirq_context);
+
extern void trace_hardirqs_on_prepare(void);
extern void trace_hardirqs_off_finish(void);
extern void trace_hardirqs_on(void);
extern void trace_hardirqs_off(void);
-# define lockdep_hardirq_context(p) ((p)->hardirq_context)
+# define lockdep_hardirq_context(p) (this_cpu_read(hardirq_context))
# define lockdep_softirq_context(p) ((p)->softirq_context)
-# define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
+# define lockdep_hardirqs_enabled(p) (this_cpu_read(hardirqs_enabled))
# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
-# define lockdep_hardirq_enter() \
-do { \
- if (!current->hardirq_context++) \
- current->hardirq_threaded = 0; \
+# define lockdep_hardirq_enter() \
+do { \
+ if (this_cpu_inc_return(hardirq_context) == 1) \
+ current->hardirq_threaded = 0; \
} while (0)
# define lockdep_hardirq_threaded() \
do { \
@@ -50,7 +55,7 @@ do { \
} while (0)
# define lockdep_hardirq_exit() \
do { \
- current->hardirq_context--; \
+ this_cpu_dec(hardirq_context); \
} while (0)
# define lockdep_softirq_enter() \
do { \
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -20,6 +20,7 @@ extern int lock_stat;
#define MAX_LOCKDEP_SUBCLASSES 8UL
#include <linux/types.h>
+#include <asm/percpu.h>
enum lockdep_wait_type {
LD_WAIT_INV = 0, /* not checked, catch all */
@@ -703,28 +704,29 @@ do { \
lock_release(&(lock)->dep_map, _THIS_IP_); \
} while (0)
-#define lockdep_assert_irqs_enabled() do { \
- WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- !current->hardirqs_enabled, \
- "IRQs not enabled as expected\n"); \
- } while (0)
+DECLARE_PER_CPU(int, hardirqs_enabled);
+DECLARE_PER_CPU(int, hardirq_context);
-#define lockdep_assert_irqs_disabled() do { \
- WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- current->hardirqs_enabled, \
- "IRQs not disabled as expected\n"); \
- } while (0)
+#define lockdep_assert_irqs_enabled() \
+do { \
+ WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirqs_enabled)); \
+} while (0)
-#define lockdep_assert_in_irq() do { \
- WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- !current->hardirq_context, \
- "Not in hardirq as expected\n"); \
- } while (0)
+#define lockdep_assert_irqs_disabled() \
+do { \
+ WARN_ON_ONCE(debug_locks && this_cpu_read(hardirqs_enabled)); \
+} while (0)
+
+#define lockdep_assert_in_irq() \
+do { \
+ WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirq_context)); \
+} while (0)
#else
# define might_lock(lock) do { } while (0)
# define might_lock_read(lock) do { } while (0)
# define might_lock_nested(lock, subclass) do { } while (0)
+
# define lockdep_assert_irqs_enabled() do { } while (0)
# define lockdep_assert_irqs_disabled() do { } while (0)
# define lockdep_assert_in_irq() do { } while (0)
@@ -734,7 +736,7 @@ do { \
# define lockdep_assert_RT_in_threaded_ctx() do { \
WARN_ONCE(debug_locks && !current->lockdep_recursion && \
- current->hardirq_context && \
+ lockdep_hardirq_context(current) && \
!(current->hardirq_threaded || current->irq_config), \
"Not in threaded context on PREEMPT_RT as expected\n"); \
} while (0)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -991,8 +991,6 @@ struct task_struct {
unsigned long hardirq_disable_ip;
unsigned int hardirq_enable_event;
unsigned int hardirq_disable_event;
- int hardirqs_enabled;
- int hardirq_context;
u64 hardirq_chain_key;
unsigned long softirq_disable_ip;
unsigned long softirq_enable_ip;
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1954,8 +1954,8 @@ static __latent_entropy struct task_stru
rt_mutex_init_task(p);
+ lockdep_assert_irqs_enabled();
#ifdef CONFIG_PROVE_LOCKING
- DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);
DEBUG_LOCKS_WARN_ON(!p->softirqs_enabled);
#endif
retval = -EAGAIN;
@@ -2036,7 +2036,6 @@ static __latent_entropy struct task_stru
#endif
#ifdef CONFIG_TRACE_IRQFLAGS
p->irq_events = 0;
- p->hardirqs_enabled = 0;
p->hardirq_enable_ip = 0;
p->hardirq_enable_event = 0;
p->hardirq_disable_ip = _THIS_IP_;
@@ -2046,7 +2045,6 @@ static __latent_entropy struct task_stru
p->softirq_enable_event = 0;
p->softirq_disable_ip = 0;
p->softirq_disable_event = 0;
- p->hardirq_context = 0;
p->softirq_context = 0;
#endif
--- a/kernel/locking/lockdep.c
+++ b/kernel/locking/lockdep.c
@@ -2062,9 +2062,9 @@ print_bad_irq_dependency(struct task_str
pr_warn("-----------------------------------------------------\n");
pr_warn("%s/%d [HC%u[%lu]:SC%u[%lu]:HE%u:SE%u] is trying to acquire:\n",
curr->comm, task_pid_nr(curr),
- curr->hardirq_context, hardirq_count() >> HARDIRQ_SHIFT,
+ lockdep_hardirq_context(curr), hardirq_count() >> HARDIRQ_SHIFT,
curr->softirq_context, softirq_count() >> SOFTIRQ_SHIFT,
- curr->hardirqs_enabled,
+ lockdep_hardirqs_enabled(curr),
curr->softirqs_enabled);
print_lock(next);
@@ -3658,7 +3658,7 @@ void lockdep_hardirqs_on_prepare(unsigne
if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (unlikely(current->hardirqs_enabled)) {
+ if (unlikely(lockdep_hardirqs_enabled(current))) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3686,7 +3686,7 @@ void lockdep_hardirqs_on_prepare(unsigne
* Can't allow enabling interrupts while in an interrupt handler,
* that's general bad form and such. Recursion, limited stack etc..
*/
- if (DEBUG_LOCKS_WARN_ON(current->hardirq_context))
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirq_context(current)))
return;
current->hardirq_chain_key = current->curr_chain_key;
@@ -3724,7 +3724,7 @@ void noinstr lockdep_hardirqs_on(unsigne
if (unlikely(current->lockdep_recursion & LOCKDEP_RECURSION_MASK))
return;
- if (curr->hardirqs_enabled) {
+ if (lockdep_hardirqs_enabled(curr)) {
/*
* Neither irq nor preemption are disabled here
* so this is racy by nature but losing one hit
@@ -3751,7 +3751,7 @@ void noinstr lockdep_hardirqs_on(unsigne
skip_checks:
/* we'll do an OFF -> ON transition: */
- curr->hardirqs_enabled = 1;
+ this_cpu_write(hardirqs_enabled, 1);
curr->hardirq_enable_ip = ip;
curr->hardirq_enable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_on_events);
@@ -3783,11 +3783,11 @@ void noinstr lockdep_hardirqs_off(unsign
if (DEBUG_LOCKS_WARN_ON(!irqs_disabled()))
return;
- if (curr->hardirqs_enabled) {
+ if (lockdep_hardirqs_enabled(curr)) {
/*
* We have done an ON -> OFF transition:
*/
- curr->hardirqs_enabled = 0;
+ this_cpu_write(hardirqs_enabled, 0);
curr->hardirq_disable_ip = ip;
curr->hardirq_disable_event = ++curr->irq_events;
debug_atomic_inc(hardirqs_off_events);
@@ -3832,7 +3832,7 @@ void lockdep_softirqs_on(unsigned long i
* usage bit for all held locks, if hardirqs are
* enabled too:
*/
- if (curr->hardirqs_enabled)
+ if (lockdep_hardirqs_enabled(curr))
mark_held_locks(curr, LOCK_ENABLED_SOFTIRQ);
lockdep_recursion_finish();
}
@@ -3881,7 +3881,7 @@ mark_usage(struct task_struct *curr, str
*/
if (!hlock->trylock) {
if (hlock->read) {
- if (curr->hardirq_context)
+ if (lockdep_hardirq_context(curr))
if (!mark_lock(curr, hlock,
LOCK_USED_IN_HARDIRQ_READ))
return 0;
@@ -3890,7 +3890,7 @@ mark_usage(struct task_struct *curr, str
LOCK_USED_IN_SOFTIRQ_READ))
return 0;
} else {
- if (curr->hardirq_context)
+ if (lockdep_hardirq_context(curr))
if (!mark_lock(curr, hlock, LOCK_USED_IN_HARDIRQ))
return 0;
if (curr->softirq_context)
@@ -3928,7 +3928,7 @@ mark_usage(struct task_struct *curr, str
static inline unsigned int task_irq_context(struct task_struct *task)
{
- return LOCK_CHAIN_HARDIRQ_CONTEXT * !!task->hardirq_context +
+ return LOCK_CHAIN_HARDIRQ_CONTEXT * !!lockdep_hardirq_context(task) +
LOCK_CHAIN_SOFTIRQ_CONTEXT * !!task->softirq_context;
}
@@ -4021,7 +4021,7 @@ static inline short task_wait_context(st
* Set appropriate wait type for the context; for IRQs we have to take
* into account force_irqthread as that is implied by PREEMPT_RT.
*/
- if (curr->hardirq_context) {
+ if (lockdep_hardirq_context(curr)) {
/*
* Check if force_irqthreads will run us threaded.
*/
@@ -4864,11 +4864,11 @@ static void check_flags(unsigned long fl
return;
if (irqs_disabled_flags(flags)) {
- if (DEBUG_LOCKS_WARN_ON(current->hardirqs_enabled)) {
+ if (DEBUG_LOCKS_WARN_ON(lockdep_hardirqs_enabled(current))) {
printk("possible reason: unannotated irqs-off.\n");
}
} else {
- if (DEBUG_LOCKS_WARN_ON(!current->hardirqs_enabled)) {
+ if (DEBUG_LOCKS_WARN_ON(!lockdep_hardirqs_enabled(current))) {
printk("possible reason: unannotated irqs-on.\n");
}
}
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -107,6 +107,12 @@ static bool ksoftirqd_running(unsigned l
* where hardirqs are disabled legitimately:
*/
#ifdef CONFIG_TRACE_IRQFLAGS
+
+DEFINE_PER_CPU(int, hardirqs_enabled);
+DEFINE_PER_CPU(int, hardirq_context);
+EXPORT_PER_CPU_SYMBOL_GPL(hardirqs_enabled);
+EXPORT_PER_CPU_SYMBOL_GPL(hardirq_context);
+
void __local_bh_disable_ip(unsigned long ip, unsigned int cnt)
{
unsigned long flags;
^ permalink raw reply
* Re: [PATCH v2 1/2] ASoC: fsl_mqs: Don't check clock is NULL before calling clk API
From: Shengjiu Wang @ 2020-06-23 8:32 UTC (permalink / raw)
To: Markus Elfring
Cc: Linux-ALSA, Timur Tabi, Xiubo Li, Fabio Estevam, Shengjiu Wang,
kernel-janitors, Takashi Iwai, linux-kernel, Nicolin Chen,
Mark Brown, linuxppc-dev
In-Reply-To: <39ac8f24-3148-2a3d-3f8d-91567b3c4c9e@web.de>
On Tue, Jun 23, 2020 at 3:38 PM Markus Elfring <Markus.Elfring@web.de> wrote:
>
> > In-Reply-To: <cover.1592888591.git.shengjiu.wang@nxp.com>
>
> I guess that it should be sufficient to specify such a field once
> for the header information.
seems it's caused by my "git format-patch" command, I will update
it, hope it is better next time.
>
>
> > Because clk_prepare_enable and clk_disable_unprepare should
> > check input clock parameter is NULL or not internally,
>
> I find this change description unclear.
clk_prepare_enable and clk_disable_unprepare check the input
clock parameter in the beginning of the function, if the parameter
is NULL, clk_prepare_enable and clk_disable_unprepare will
return immediately.
So Don't need to check input clock parameters before calling clk
API.
Do you think this commit message is better?
best regards
wang shengjiu
^ permalink raw reply
* Re: [PATCH v2 1/2] ASoC: fsl_mqs: Don't check clock is NULL before calling clk API
From: Markus Elfring @ 2020-06-23 7:36 UTC (permalink / raw)
To: Shengjiu Wang, alsa-devel, linuxppc-dev
Cc: Timur Tabi, Xiubo Li, Takashi Iwai, kernel-janitors, linux-kernel,
Jaroslav Kysela, Nicolin Chen, Mark Brown, Fabio Estevam
> In-Reply-To: <cover.1592888591.git.shengjiu.wang@nxp.com>
I guess that it should be sufficient to specify such a field once
for the header information.
> Because clk_prepare_enable and clk_disable_unprepare should
> check input clock parameter is NULL or not internally,
I find this change description unclear.
> then we don't need to check them before calling the function.
Please use an imperative wording for the commit message.
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=dd0d718152e4c65b173070d48ea9dfc06894c3e5#n151
Regards,
Markus
^ permalink raw reply
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